Which of the following is the best explanation as to how the moon formed?
Which of the following is NOT one of the inner planets?
A specific pattern of stars
The hottest stars are which color?
The hottest planet in the solar system.
Stars spend 90% of their lives as main-sequence stars.
A star's brightness as it appears from Earth is called its __________________ magnitude.
Explosive outbursts of energy from the sun's surface
This planet is unusual in that it rotates on its side.
Stars produce energy through the process of
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